Prinzmetal`s angina and Stable angina: Starts with 10mg 8th hourly. Increases the dosage up to 20mg 8th hourly. Further increases the dosage based on patient`s response at weekly intervals and repeat at 8th to 6th hourly.
Maximum daily dose: 120mg
Hypertension: 20mg twice daily or 30 to 60mg once daily extended release formulations. Adjust the dosage based on patient`s response.Maximum dose: 4omg twice daily
Maximum dose for extended release formulations: 120mg/day
Emergency reduction of blood pressure: Chew 10mg tablet and at the same time swallow another 10mg tablet. Repeat at every 20 to 30minutes.
As Tocolytic: 10mg sublingually and repeat at 20minutes for 2 to 3 doses.
Maintenance dosage: 10 to 20mg orally every 4 to 6 hours
Children:
For hypertensive emergencies: 250mcg to 500mcg/kg/dose 3 to 4 times daily.